gloam vs nightfall

gloam and nightfall both are nouns.

Word	Noun	Adjective	Verb	Adverb
gloam	Yes	No	No	No
nightfall	Yes	No	No	No

As nouns, gloam and nightfall are synonyms defined as:

Other synonyms of gloam include crepuscle, crepuscule, dusk, evenfall, fall, gloaming, twilight.

gloam (noun)	nightfall (noun)
the time of day immediately following sunset	the time of day immediately following sunset